Marmot have developed a new waterproof breathable fabric that reduces the environmental impact of the manufacturing process. Dye and Dwr are built into the yarn rather than applied on top after. It doesn?€?t ever wash off. This reduces waste and radically reduces the need to reproof garments over their lifespan. Performance is not compromised , with a decent 20,000mm hydrostatic head and 20,000 mvtr